Obturator having an insufflation pathway and an instrument guide

ABSTRACT

A surgical access apparatus is presented including a cannula having a housing and a cannula shaft, the cannula shaft defining an internal lumen and a slot in communication with the internal lumen and an obturator insertable through the internal lumen of the cannula. The obturator includes an obturator shaft having a proximal end and a distal end and a tip member disposed at the distal end of the obturator shaft, the tip member configured to form an incision through tissue. An outer surface of the obturator shaft and the tip member defines a channel for receiving and directing insufflation fluid into a body cavity, a portion of the same channel also configured to guide a surgical instrument, such as a suture passer/grasper for closing an incision, towards and through the slot. In this way, the cannula and obturator can be employed both for forming an incision at the beginning of a surgical procedure and for closing the same incision at the conclusion of the surgical procedure.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of U.S. patent applicationSer. No. 14/736,918, filed Jun. 11, 2015, now U.S. Pat. No. 10,105,161which claims the benefit of and priority to U.S. Provisional PatentApplication Ser. No. 62/037,719, filed Aug. 15, 2014, the entiredisclosure of which are incorporated by reference herein.

BACKGROUND Technical Field

The present disclosure relates to a surgical access assembly includingan obturator and a cannula. More particularly, the present disclosurerelates to an obturator with an outer surface having a channel fortransmitting fluids therealong, as well as for guiding surgicalinstruments through slots on the cannula.

Background of Related Art

Minimally invasive procedures are continually increasing in number andvariation. Forming a relatively small diameter, temporary pathway to thetarget site is a key feature of most minimally invasive surgicalprocedures. The most common method of providing such a pathway is byinserting an access assembly through the skin. Common access assembliesgenerally include a cannula configured to accommodate a trocar forpenetrating tissue, and an obturator for dilating and creating a pathwaythrough tissue. Obturators may be blunt members that are insertedthrough the cannula to tunnel a path through tissue and subsequently toa selected surgical site.

Minimally invasive procedures often supply insufflation fluids, e.g.,carbon dioxide, to a body cavity underlying a layer of tissue such thatthe layer of tissue lifts away from underlying tissue or organstructures to create a larger working space. To this end, a source ofinsufflation fluid may be coupled to the cannula such that insufflationfluids flow distally into a body cavity. In many procedures, it isdesirable to insufflate the body cavity of a patient while the obturatoris inserted through the cannula. In such an arrangement, insufflationfluids may be introduced through an interior portion of the obturator,and exit through an opening in a distal portion or tip of the obturatorwithin the working space. Such an arrangement typically incorporates anadditional source of insufflation fluid coupled with the obturator, aswell as a sealing member within the obturator to inhibit the proximalmigration of insufflation fluids through the obturator.

SUMMARY

According to one aspect of the present disclosure, a surgical accessapparatus is presented. The surgical access apparatus includes a cannulaincluding a housing and a cannula shaft, the cannula shaft defining aninternal lumen and at least one slot in communication with the internallumen and an obturator insertable through the internal lumen of thecannula. The obturator includes an obturator shaft having a proximal endand a distal end and a tip member disposed at the distal end of theobturator shaft, the tip member configured to be inserted throughtissue. An outer surface of the obturator shaft and the tip memberdefines a channel for receiving insufflation fluid.

In one exemplary embodiment, the obturator is configured to receive anendoscope.

In another exemplary embodiment, the channel is not in fluidcommunication with an interior of the obturator. The channel extendsfrom a proximalmost end of the obturator shaft to a distalmost end ofthe tip member.

In yet another exemplary embodiment, when the obturator shaft isdisposed in the lumen of the cannula shaft, an annular space is definedbetween the obturator shaft and the cannula shaft. The annular space isconfigured to receive a surgical instrument therethrough.

In another exemplary embodiment, at least one seal member is disposed inthe cannula and is configured to form a fluid-tight seal with theobturator inserted therethrough.

In yet another exemplary embodiment, the at least one slot includes twoslots in opposed relation thereof and the cannula is configured to becoupled to a source of fluid. The two slots each include a sealingmember configured to be penetrated by a distal end of a surgicalinstrument.

In another exemplary embodiment, the channel is configured to receive asurgical instrument therethrough, a distal end of the surgicalinstrument configured to extend through the at least one slot. Thechannel is further configured to direct the insufflation fluid to thetip member of the obturator.

According to another aspect of the present disclosure, a surgical accessassembly is presented. The surgical access assembly includes a cannulaassembly including a cannula defining two slots in opposed relationthereof and an obturator assembly including an obturator shaft having atip member at a distal end thereof, the obturator shaft and tip memberhaving an outer surface that defines a channel, the channel configuredto convey insufflation fluid from a proximalmost end of the obturatorshaft to a distalmost end of the tip member.

According to another aspect of the present disclosure, a method ofaccessing a surgical site is presented. The method of accessing asurgical site for performing a surgical procedure includes inserting atleast a portion of a cannula assembly through tissue, the cannulaassembly including a cannula defining two slots in opposed relationthereof, inserting an obturator assembly through the cannula assembly,the obturator assembly including an obturator shaft having a tip memberat a distal end thereof, the obturator shaft and tip member having anouter surface that defines a channel, conveying insufflation fluid, viathe channel, from a proximalmost end of the obturator shaft to adistalmost end of the tip member, and, upon completion of the surgicalprocedure, inserting a surgical instrument through the channel, a distalend of the surgical instrument extending through one of the two slots.

The present invention, according to various embodiments thereof, mayalso relate to a surgical access apparatus, comprising a cannulaincluding a housing and a cannula shaft, the cannula shaft defining aninternal lumen and a slot in communication with the internal lumen; andan obturator insertable through the internal lumen of the cannula, theobturator including: an obturator shaft having a proximal end and adistal end; and a tip member disposed at the distal end of the obturatorshaft, the tip member configured to be inserted through tissue; whereinan outer surface of the obturator shaft and the tip member defines achannel for receiving insufflation fluid, the channel also configured toguide a surgical instrument towards and through the slot.

The obturator may be transparent so as to enable visualization when anendoscope is positioned therein. The channel may avoid fluidcommunication with an interior of the obturator. The channel may extendfrom a proximalmost end of the obturator shaft to a distalmost end ofthe tip member. When the obturator shaft is disposed in the lumen of thecannula shaft, an annular space may be defined between the obturatorshaft and the cannula shaft. The surgical instrument may be a suturepasser/grasper configured to close an incision. At least one seal membermay be disposed in the cannula and may be configured to form afluid-tight seal with the obturator inserted therethrough.

The at least one slot may include two slots in opposed relation thereof.The two slots may each include a sealing member configured to bepenetrated by a distal end of a surgical instrument. The cannula may beconfigured to be coupled to a source of fluid. The channel may beconfigured to receive a surgical instrument therethrough, a distal endof the surgical instrument configured to extend through the at least oneslot. The channel may be configured to direct the insufflation fluid tothe tip member of the obturator.

In accordance with various embodiments, the present invention may alsorelate to a surgical assembly comprising: a cannula assembly forproviding access through a surgical incision, the cannula assemblyincluding a cannula shaft defining a slot therethrough; and an obturatorassembly including an obturator shaft having a tip member at a distalend thereof, the obturator shaft and tip member having an outer surfacethat defines a channel, the channel configured to convey insufflationfluid from a proximalmost end of the obturator shaft to a distalmost endof the tip member, the channel further configured to direct a surgicalinstrument through the slot so as to enable the surgical incision to besutured closed at the conclusion of the surgical procedure.

The channel may avoid being in fluid communication with an interior ofthe obturator. When the obturator shaft is disposed in a lumen of thecannula, an annular space may be defined between the obturator shaft andthe cannula. The cannula may define two opposing slots. The slot mayinclude a sealing member configured to be penetrated by a distal end ofthe surgical instrument. In an embodiment, at least one seal member isdisposed in the cannula assembly and is configured to form a fluid-tightseal with the obturator assembly inserted therethrough.

In still other embodiments of the present invention, there is provided amethod of performing a surgical procedure, the method comprising:inserting an obturator assembly into a cannula assembly, the cannulaassembly including a cannula shaft defining a slot therethrough, theobturator assembly including an obturator shaft having a tip member at adistal end thereof, the obturator shaft and tip member having outersurfaces that define a channel; moving the combined obturator assemblyand cannula assembly such that the tip member of the obturator shaftforms an incision through tissue; conveying insufflation fluid, alongthe outer surfaces of the obturator shaft and the tip member via thechannel and into a body cavity; removing the obturator from the cannula;upon completion of the surgical procedure, reinserting the obturatorinto the cannula; and inserting a surgical instrument such that thechannel guides a distal end of the surgical instrument through the slot.

The method may further comprise the steps of: prior to the moving step,inserting an endoscope into the obturator assembly; and using theendoscope to visualize the incision being formed by the tip member. Thesurgical instrument may be a suture passer/grasper configured to closethe incision.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute apart of this specification, illustrate embodiments of the disclosureand, together with a general description of the disclosure given above,and the detailed description of the embodiment(s) given below, serve toexplain the principles of the disclosure, wherein:

FIG. 1 is a perspective view of an obturator including a tip member inaccordance with the present disclosure;

FIG. 2 is an enlarged view of the area of detail identified in FIG. 1;

FIG. 3 is a bottom plan view of the obturator shown in FIG. 1;

FIG. 4 is a perspective view of a surgical access apparatus according tothe present disclosure, including the obturator of FIG. 1;

FIG. 5 is a perspective view of the cannula of FIG. 4 with the housingand elongated portion of the cannula shown separated from each other;

FIG. 6A is a first side view of the cannula of FIG. 4A with the housingremoved;

FIG. 6B is a second side view rotated 90 degrees of the cannula of FIG.4A with the housing removed;

FIG. 7 is a cross-sectional view of FIG. 4, shown together with across-section of a layer of tissue and underlying body cavity;

FIG. 8 is an enlarged view of the area of detail identified in FIG. 7;

FIG. 9 is a cross-sectional view depicting a surgical instrumentinserted through the channel of the obturator; and

FIG. 10 is a cross-sectional view depicting two surgical instrumentinserted through the obturator, with one surgical instrument insertedthrough the channel of the obturator.

DETAILED DESCRIPTION

Embodiments of the presently disclosed surgical access apparatus for usein minimally invasive procedures are described in detail with referenceto the drawings, in which like reference numerals designate identical orcorresponding elements in each of the several views. As used herein, theterm “distal” refers to that portion of the apparatus which is fartherfrom the operator while the term “proximal” refers to that portion ofthe apparatus which is closer to the operator. The presently disclosedsurgical access apparatus is usable in an opening through a patient'stissue, such as an incision or a naturally-occurring orifice (e.g.,mouth, anus, or vagina).

Referring initially to FIG. 4, a surgical access apparatus 1000 isshown. Surgical access apparatus 1000 includes an obturator 100insertable through a cannula 200, which will be described further indetail below.

Referring now to FIG. 1, obturator 100 includes an obturator shaft 102,a tip member 110, and a handle 108. Obturator shaft 102 is an elongatemember that defines a longitudinal axis “A,” and has a proximal end 104and a distal end 106. The handle 108 is mounted to the proximal end 104of obturator shaft 102 and may include surface features suitable forgrasping by an operator, e.g., an ergonomic grip incorporating flanges,curves, knurls, or the like. A channel 120 is formed on an outer surfaceof the obturator shaft 102. The channel 120 extends from theproximalmost end 104 of the obturator shaft 102 to the distalmost end112 of the tip member 110, as described below. Channel 120 may be asingle, continuous, non-interrupted channel that extends the length ofthe obturator 100.

Turning to FIG. 2, the tip member 110, as shown, may have a tapered,e.g., conical, pyramidal, curved, etc., configuration that tapers to adistal tip 112. Distal tip 112 may be blunt, as shown, or may haveanother desirable atraumatic configuration, e.g., curvate, spheroid, orflat. In other embodiments, distal tip 112 may be sharpened or pointedso as to be configured to penetrate tissue.

The channel 120 is formed on an outer surface of the obturator shaft102, as well as on the outer surface of the tip member 110. Channel 120,as shown, is contoured to the outer surface of tip member 110 andextends along the length of tip member 110, as well as the length of theobturator shaft 102. Channel 120 includes an open proximal end 122opposite an open distal end 124. Distal end 124 may be coterminous withdistal tip 112, or distal tip 112 may protrude past the distal end 124of channel 120, as shown. Channel 120 is defined by a pair of opposedwalls 126 joined by a channel floor 128. Channel 120 may have anydesirable configuration, e.g., arcuate or U-shaped, or may be configuredas a closed member extending along the tip member 110, e.g., a tube orbox when viewed in cross-section. Channel 120 defines a path throughwhich fluids, e.g., insufflation fluids, may flow. Additionally, channel120 defines a path through which surgical instruments are directed orguided through. In further embodiments, the walls 126 or channel floor128 may incorporate surface features such as grooves or curves, e.g., todirect or alter fluid flow through channel 120.

In some instances, the outer diameter of the obturator 100 may closelymatch the inner diameter of cannula 200 (see FIG. 4). Thus, channel 120extends along the entire length of obturator 100 or substantially theentire length of obturator 100. The channel 120 may be fluidly coupleddirectly to insufflation port 214 (see FIGS. 7-10).

Channel 120 is formed on an outer surface of tip member 110 and theobturator shaft 102 by, e.g., cutting, etching, laser treatment,electrical arcing, and the like. In some embodiments, tip member 110, aswell as obturator shaft 102 may be molded in a die or template such thatchannel 120 is pre-formed thereon. Those skilled in the art may envisionother suitable methods of forming channel 120 across the length of theobturator 100.

Referring to FIG. 3, channel 120, as shown, extends radially inward at adepth “D” along the outer surface of the tip member 110. Depth D, asshown, may be a constant dimension measured radially inward from anouter surface of the tip member 110. In this manner, channel floor 128is disposed a depth D from the outer surface of tip member 110 as thechannel 120 extends along the outer surface of the obturator shaft 102toward the tapered profile of the tip member 110 and toward the distaltip 112. In embodiments, the depth D of channel 120 may vary along thelongitudinal length of the obturator shaft 102 and the tip member 110,e.g., the distance between the outer surface of the tip member 110 andthe channel floor 128 may increase or decrease along the longitudinallength of obturator shaft 102 and the tip member 110.

Referring back to FIG. 1, tip member 110 is shown coupled with obturatorshaft 102. Tip member 110 may be mounted to the distal end 106 ofobturator shaft 102 by any suitable means, e.g., press-fit, threadedconnection, bayonet-type coupling, adhesion, or ultrasonic welding. Inembodiments, tip member 110 and obturator shaft 102 may be integrallyformed. Referring back to FIGS. 2 and 3, the open proximal end 122 ofchannel 120 provides an entrance path to channel 120 as a fluid, e.g.,insufflation fluid, advances distally along the obturator shaft 102toward the tip member 110. Tip member 110, as shown, may have a hollowinterior, or may be a solid member. Advantageously, tip member 110 andshaft 102 may be transparent, such that an endoscope positioned thereinallows visualization of the tissue during penetration.

Referring to FIGS. 1 and 4-6B, cannula 200 of surgical access assembly1000 includes an elongated portion 202 and a housing 210 including aproximal housing component 210 a and a distal housing component 210 b(see FIG. 5). Elongated portion 202 includes elongated tubular member202 a and a base member 202 b. Base member 202 b includes threading 229configured to engage complementary threading 227 of distal housingcomponent 210 b (see FIG. 5), e.g., via a bayonet connection, toreleasably engage housing 210 and elongated portion 202 to each other.Base member 202 b further includes an insufflation port 203 allowing forthe selective inflow and outflow of insufflation fluid. A collar 204 isconfigured to be seated within base member 202 b. Collar 204 furtherincludes a tab 204 a disposed within a recess 204 b defined within basemember 202 b and selectively movable within recess 204 b to unlockhousing 210 from base member 202 b, thus permitting disengagement ofhousing 210 from base member 202 b. Elongated tubular member 202 aextends distally from base member 202 b and may be formed from atranslucent material, although other configurations are alsocontemplated.

Proximal end distal housing components 210 a, 210 b, respectively, ofhousing 210 may be selectively engageable with each other via snap-fitengagement or other suitable arrangement to form housing 210.Alternatively, these components may be integrally formed with eachother, e.g., welded, snap-fit, etc.

Proximal housing component 210 a defines a pair of radially opposedapertures 211 (see FIG. 5) extending therethrough. Distal housingcomponent 210 b includes a pair of notches 226 configured tomechanically engage a pair of corresponding latches associated withobturator handle 108 (see FIG. 1) to selectively lock and unlockobturator 100 to and from cannula 200. More specifically, obturatorhandle 108 is configured to receive proximal housing component 210 atherein as elongated obturator shaft 102 is inserted into elongatedtubular member 202 a, ultimately such that latches of obturator 100 arereceived within apertures 211 of proximal housing component 210 a toselectively lock obturator 100 and cannula 200 with each other. As notedabove, housing 210 and elongated portion 202 are releasably engageablewith each other, e.g., via engagement of threadings 227, 229,respectively.

With reference in particular to FIGS. 5-6B, elongated tubular member 202a of cannula 200 may be provided in various different configurations,e.g., various diameters between about 5 mm to about 15 mm and/or variouslengths from about 70 mm to about 150 mm, although other suitableconfigurations are also contemplated. Elongated tubular member 202 a maydefine a ribbed exterior (as shown) or may define a generally smoothexterior, depending on a particular purpose. Elongated tubular member202 a is configured for positioning within an opening in tissue anddefines a longitudinal passageway 205 extending therethrough that isconfigured to receive surgical instrumentation (not shown) for guidingthe surgical instrumentation through the opening in tissue and into theinternal surgical site. Passageway 205 of elongated tubular member 202 ais further configured to receive elongated obturator shaft 102 ofobturator 100 (see FIG. 1) to facilitate insertion of elongated tubularmember 202 a into the opening in tissue.

A pair of opposed slots 206 extend through the annular side wall ofelongated tubular member 202 a (see FIG. 6A), thus providing lateralaccess to and from longitudinal passageway 205 to and from the exteriorof elongated tubular member 202 a. Opposed slots 206 may be positionedalong the length of elongated tubular member 202 a at any suitableposition, e.g., closer to or further from base member 202 b of elongatedportion 202 of cannula 200.

Thus, a cannula 200 including a particular positioning of slots 206 maybe selected based upon on the procedure being performed, the location ofthe opening in tissue, the patient's anatomy, the user's preference,and/or other factors. For some procedures, it has been found to bedesirable that, once cannula 200 is positioned within the opening intissue, slots 206 are positioned distally of the skin and fatty layersof tissue and adjacent to the fascia and muscle layers of tissue sincefascia and muscle layers are better suited to receive and retain asuture for closing the opening in tissue. Thus, a cannula 200 havingslots 206 positioned to achieve this configuration may be selected.However, other configurations are also contemplated. Further, as analternative or in addition to providing multiple cannulas 200 havingdifferently positioned slots 206, multiple pairs of opposed slots 206may be spaced-apart along the length of elongated tubular member 202 asuch that an appropriately positioned pair of slots 206 may be utilized,e.g., depending on the procedure being performed, the location of theopening in tissue, the patient's anatomy, the user's preference, and/orother factors.

Turning now to FIGS. 7-10, the obturator 100 is configured for insertionthrough cannula 200. Cannula 200 includes a housing 210 and a cannulashaft 220 extending distally from the housing 210. Housing 210 definesan interior annular recess and includes a proximal end 211 and a distalend 212 each defining an aperture configured to accommodate insertion ofthe obturator shaft 102 therethrough. Cannula shaft 220 has an openproximal end 221 opposite an open distal end 222, and defines aninternal lumen 224 extending from the proximal end 221 to the distal end222. Lumen 224 is dimensioned to accommodate passage of the obturatorshaft 102 and tip member 110 through the cannula shaft 220.

A seal member 218, as shown, may be disposed within housing 210. Sealmember 218 may be press fit, adhered, welded, or otherwise securedwithin housing 210. Seal member 218 is configured to sealably engageobturator shaft 102, or an instrument inserted therethrough.Accordingly, seal member 218 may be configured as a septum, conical, ordisc seal. In embodiments, seal member 218 may be configured as azero-closure seal, e.g., a duckbill, and may be configured to inhibitthe proximal migration of fluids through cannula 200 in the absence ofan instrument inserted therethrough. In further embodiments, cannula 200may incorporate multiple seal members of varying configurations. Suchseal members may be disposed in either or both the cannula housing 210or cannula shaft 220.

Obturator 100, as shown, is insertable through lumen 224 of cannulashaft 220. Obturator 100 is dimensioned such that upon engagement of thehandle 108 with the proximal end 211 of housing 210 of cannula 200,channel 120 is exposed across the length of the cannula shaft 220. Atleast a portion of tip member 110 remains disposed within lumen 224.

Housing 210, as shown, includes an insufflation port 214 fortransmitting fluids, e.g., insufflation fluids, therethrough.Insufflation port 214 may be configured as a stopcock or other suitablefluid port. Insufflation port 214 may be coupled with, e.g., a source ofinsufflation fluid or vacuum, or to a fluid line connected to a fluidsource. Insufflation port 214 may include a valve or fluid lock forselectively controlling the flow of fluids through insufflation port214.

With continued reference to FIGS. 7-10, the surgical access apparatus1000, as shown, is configured to be inserted through a layer of tissue“T.” Tissue T defines a body cavity “BC,” which may include underlyingstructures “S,” such as tissue or body organs. FIGS. 7-10 furtherillustrate a penetration or incision of tissue T. An operator may grasphandle 108 of obturator 100 and, upon distal movement of obturator 100,tip member 110 dilates and advances through tissue T, creating a pathfor cannula shaft 220 to be inserted through tissue T.

Cannula shaft 220 includes the pair of opposed slots 206. The pair ofopposed slots 206 are selectively positionable relative to the tissue Tby a user inserting or withdrawing the cannula shaft 220 to a desireddepth, as will be described more fully below. As mentioned previously,cannula shaft 220 may be transparent such that the position of cannula200 within the tissue may be viewed by a user with an endoscopepositioned within the cannula shaft 220. For instance, an endoscope sopositioned may inform a user as to when the distal end 222 is within theincision or when the slots 206 are at a depth relative to the tissue Tsuch that sutures/graspers inserted through the slots 206 will penetratethe tissue T at a desired depth for closing the fascial layers of thetissue after a surgery has been completed. Additionally, the user couldknow when the surgical access apparatus 1000 is in a position whereinsufflation fluid would be effectively trapped by the tissue andretained within the insufflation channel 120. Insufflation fluids “F”are introduced through insufflation port 214 and into lumen 224 ofcannula shaft 220 and into channel 120, which extends the length of theobturator shaft 102. The presence of the obturator shaft 102 having thechannel 120 within lumen 224 defines an annular space through whichinsufflation fluids F flow (see FIG. 8).

Seal member 218, as described above, inhibits the proximal migration ofinsufflation fluids F through the cannula shaft 220. Accordingly,pressurized insufflation fluids F entering cannula 200 throughinsufflation port 214 advance distally through lumen 224 and the channel120 toward tip member 110.

Channel 120 is exposed within the lumen 224 such that insufflationfluids F may enter channel 120 and advance distally into body cavity BC.Channel 120 extends the length of the obturator shaft 102. Theproximalmost end of channel 120 is located adjacent the insufflationport 214, whereas the distalmost end of the channel 120 is located at ornear the tip 112 of the tip member 110. As pressurized fluids build upwithin lumen 224, channel 120 provides a path of least resistance alongwhich pressurized insufflation fluids F will escape the higher-pressureenvironment within lumen 224. Accordingly, controlling the rate of flowthrough insufflation port 214 affects the fluid pressure within lumen224 and the flow of insufflation fluids F along channel 120 and intobody cavity BC.

In this manner, the supply of insufflation fluids F to body cavity BC isachieved directly through the cannula 200 between the inner wall of thecannula shaft 202 and the outer wall of the obturator shaft 102. Thepassage of insufflation fluids F along an outer surface of the obturatorshaft 102 and the tip member 110 of obturator 100 obviates the need forinsufflation gas to enter into the interior of the obturator shaft 102and the need for accompanying sealing structures which such prior artarrangements require.

The introduction of pressurized insufflation fluids F into body cavityBC creates an insufflated workspace such that tissue T may be liftedaway from underlying structures S (see FIGS. 9 and 10). The positioningof the channel 120 across the length of the outer surface of theobturator 100 enables insufflation fluids to begin to be introduced intothe body cavity BC almost immediately upon the distal tip 112 of the tipmember 110 penetrating through the abdominal wall and under observationby a surgeon when an endoscope is positioned within the obturator shaft102. Accordingly, a larger working space is created for a minimallyinvasive procedure such that further advancement of the obturator 100safely into body cavity BC is possible, facilitating, e.g., furthervisualization or illumination of the body cavity BC, or further dilationof tissue T or structures S to reach a desired working site. Once thetissue, e.g., the abdominal wall, has been fully penetrated, theobturator 100 may be withdrawn from the cannula 200, and anotherinstrument (not shown) may be inserted through the cannula 200. Asdescribed above, the seal member 218 may be configured to maintaininsufflation fluids F within body cavity BC in the absence of obturator100 or another instrument.

Regarding FIG. 9, a cross-sectional view depicting a surgical instrument700 inserted through the channel 120 of the obturator 100 is shown. Thesurgical instrument 700 is inserted through the obturator 100 such thatthe distal end of the surgical instrument 700 is directed or guidedthrough the channel 120. The distal end of the surgical instrument 700exits the corresponding slot 206 of cannula 200 (penetrating the sealingmember 251 disposed thereabout), tissue, and into the internal surgicalsite. Therefore, the channel 120 is configured to receive a surgicalinstrument 700 therethrough, a distal end of the surgical instrumentconfigured to extend through the corresponding slot 206 of the cannula200. In addition, as mentioned above, the channel 120 is configured todirect the insufflation fluid F toward the distal tip 112 of the tipmember 110. Thus, channel 120 formed on the outer or external surface ofthe obturator shaft 102 and the tip member 110 serves a dual purpose.One purpose is for directing insufflation fluid F into the body cavityBC and a second purpose is for directing a surgical instrument 700(e.g., a suture passer/grasper) to close the trocar puncture wound atthe conclusion of the surgical procedure.

Moreover, elongated tubular member 202 a may further include a sealingfeature 251, sealingly disposed about each of slots 206 and configuredto maintain a fluid-tight seal about elongated tubular member 202 a toinhibit fluid exchange between longitudinal passageway 205 and theexterior of elongated tubular member 202 a via slots 206. As can beappreciated, such a configuration allows for the maintenance of aninsufflated internal surgical site during the course of a surgicalprocedure. Once maintaining insufflation is no longer necessary and/orwhere access through slots 206 is needed, e.g., after the surgicalprocedure has been completed, the sealing members 251 may be penetratedto facilitate usage of the surgical instrument 700 (see FIGS. 9 and 10).

Sealing member 251 may be formed from any suitable flexible, penetrablematerial, e.g., rubber, PVC, etc., and may be disposed about elongatedtubular member 202 a via heat shrink wrapping, overmolding, or any othersuitable process. Sealing member 251 substantially conforms to theexterior configuration of elongated tubular member 202 a so as tomaintain the ribbed configuration of the exterior of elongated tubularmember 202 a.

Regarding FIG. 10, a cross-sectional view depicting two surgicalinstruments 700 inserted through the obturator 100 is presented, withone surgical instrument 700 inserted through the channel 120 of theobturator 100.

In FIG. 10, a first surgical instrument 700 is inserted through theobturator 100 to pass through the channel 120, such that the distal endof the surgical instrument exits the corresponding slot 206, whereas asecond surgical instrument 700 is inserted through the obturator 200 topass through the lumen 224 of the cannula shaft 220 and exit through thecorresponding slot 206. Therefore, more than one surgical instrument 700may be inserted through the obturator 100 in order for each surgicalinstrument 700 to engage a corresponding slot 206 of cannula 200.Therefore, the channel 120 serves the dual purpose of introducinginsufflation fluids to a surgical site, as well as subsequentlyintroducing at least one surgical instrument to the surgical site. Itshould be noted that, in various embodiments, the obturator shaft 102may have a channel 120 formed on both sides thereof (such that opposingslots of the cannula can be employed simultaneously or sequentiallywithout moving the obturator relative to the cannula), or else on only asingle side thereof (whereby opposing slots of the cannula can beemployed sequentially by an operator by first aligning the channel witha first slot and then subsequently rotating the obturator relative tothe cannula until the channel aligns with the second slot).

The present disclosure may provide various advantages over conventionalarrangements, such as obviating the use of a veress needle to introduceinsufflation fluids. As shown in FIGS. 7-10, the positioning of thedistal end 124 of the channel 120 across the outer surface of theobturator shaft 102 and the tip member 110 enables insufflation fluidsto begin to be introduced into the body cavity BC almost immediatelyupon the distal tip 112 of the tip member 110 penetrating through theabdominal wall. By eliminating the use of a veress needle, thisarrangement minimizes the likelihood that an injury to underlyinganatomical structures will occur. The introduction of pressurizedinsufflation fluids F into body cavity BC in order to create aninsufflated workspace (which is typically a requirement of laparoscopicsurgeries such that tissue T may be lifted away from underlyingstructures S) is performed much more safely than with a conventionalveress needle.

Still further, the present disclosure may provide various advantagesover conventional arrangements such as certain optical obturators. Forexample, there exist optical obturators that receive endoscopes therein;these optical obturators may include holes along their shafts or attheir proximal ends for allowing insufflation fluid to enter the hollowinterior of the optical obturator, as well as holes near the distal endthereof for expelling the insufflation fluids from the hollow interiorand into a body cavity. While these distally located holes may providefor the flow of insufflation fluids, they are located more proximallyrelative to its respective distalmost tip than may be achieved by thepositioning of the distal end 124 of the channel 120, and thus thedistalmost tip of these conventional optical obturators must be insertedfarther into a body cavity in order for insufflation fluids to begin toflow into the body cavity. By needing to be inserted farther into a bodycavity prior to insufflation fluids beginning to flow into the bodycavity, these conventional optical obturators have a higher risk ofinadvertently damaging the underlying anatomical structures.

In contrast, the distal end 124 of the channel 120 may be positioned atthe distalmost end of the tip member 110. This arrangement enablesinsufflation fluids to begin to be introduced into the body cavity BCalmost immediately upon the distal tip 112 of the tip member 110penetrating through the abdominal wall, and earlier than would bepossible in such above-described conventional optical obturators. Thisfurther reduces the likelihood that an injury to underlying anatomicalstructures will occur and further improves patient safety. Still anotheradvantage of various embodiments of the present invention is that,because an outer surface of the obturator shaft and the tip memberdefines a channel for receiving and directing insufflation fluid into abody cavity AND a portion of the same channel is also configured toguide a surgical instrument, such as a suture passer/grasper for closingan incision, towards and through the slot, the cannula and obturator canbe employed both for forming an incision at the beginning of a surgicalprocedure and for closing the same incision at the conclusion of thesurgical procedure. Typical fascial closure devices require completelydifferent components, or at least a fascial closure mandrel that is aseparate component from the obturator. The present invention, accordingto various embodiments thereof, avoids this duplication of componentsand combines the functionality of conventional cannula/obturators andconventional fascial closure devices into a single cannula/obturatordevice that can perform all such functions.

A still further advantage of the present disclosure as compared to theabove-described conventional optical obturators is that the provision ofa channel on the outer surface of the obturator shaft and the tip membermay help avoid the need for other seals that are employed in theabove-described conventional optical obturators. For example, theseconventional optical obturators may also include a seal at the distalend of the cannula tube, this distal cannula seal sealing between thecannula tube and the outer surface of the obturator. Such a seal istypically necessary such that insufflation fluid received via thecannula housing is directed first through the holes in the opticalobturator and into the interior of the optical obturator and then out ofthe interior through the distalmost hole of the obturator. Without thedistal cannula seal, insufflation fluid received via the cannula housingwould attempt to be expelled out of the distal end of the cannula tube,between the inner wall of the cannula tube and the outer surface of theobturator, but would be prevented from doing so because of the directcontact between the tip of the optical member and the tissue. Again,this distal cannula seal adds costs and complexity to the manufacture ofthis conventional optical obturator, as well as provides anotherpotential leak path during a surgical procedure.

The present disclosure, according to various embodiments thereof, mayalso provide the advantage that it requires virtually no modificationsof the various components of a trocar. As set forth above, not only mustthe above-described conventional optical obturators provide twoadditional seals (a first seal between the interior surface of theoptical obturator and the endoscope; and a distal cannula seal betweenthe interior surface of the cannula tube and the outer surface of theoptical obturator), but almost all of the components of this system arerequired to be re-designed as compared to an ordinary trocar in order toaccommodate these seals and the desired flow of insufflation fluid intothe interior of the optical obturator. In contrast, every component ofthe system of the present disclosure may remain completely unchangedfrom an ordinary trocar, thereby saving costs and enabling theadvantages of the present disclosure to be provided simply by providinga channeled tip member on an ordinary trocar system, without requiringmodification of the remaining components of the trocar system.

From the foregoing and with reference to the various figure drawings,those skilled in the art will appreciate that certain modifications canalso be made to the present disclosure without departing from the scopeof the same. While several embodiments of the disclosure have been shownin the drawings, it is not intended that the disclosure be limitedthereto, as it is intended that the disclosure be as broad in scope asthe art will allow and that the specification be read likewise.Therefore, the above description should not be construed as limiting,but merely as exemplifications of particular embodiments. Those skilledin the art will envision other modifications within the scope and spiritof the claims appended hereto.

What is claimed is:
 1. A method of performing a surgical procedurecomprising: inserting an obturator assembly into a cannula assemblyhaving a cannula shaft defining a slot, the obturator assembly includingan obturator shaft having a tip member at a distal end thereof, theobturator shaft and tip member having outer surfaces defining a channel;forming an incision through tissue; inserting the cannula assemblythrough the incision; supplying insufflation fluid along the outersurfaces of the obturator shaft and the tip member via the channel andinto a body cavity; and inserting a surgical instrument through thechannel.
 2. The method according to claim 1, wherein inserting thesurgical instrument includes advancing the surgical instrument throughthe slot of the cannula shaft.
 3. The method according to claim 1,wherein inserting the surgical instrument includes the channelconfigured to guide the surgical instrument towards the slot.
 4. Themethod according to claim 1, further comprising inserting an endoscopeinto the obturator assembly.
 5. The method according to claim 1, furthercomprising inserting the obturator tip through tissue to create a pathfor the cannula.
 6. The method according to claim 1, wherein insertingthe obturator assembly into the cannula assembly includes the channel ofthe obturator shaft having a proximal-most end disposed adjacent aninsufflation portion of the cannula assembly.
 7. The method according toclaim 1, wherein inserting the obturator assembly into the cannulaassembly includes the cannula assembly being transparent.
 8. The methodaccording to claim 1, wherein inserting the obturator assembly into thecannula assembly includes inserting the obturator assembly through alumen defined in the cannula assembly, the lumen in communication withthe slot.
 9. The method according to claim 8, wherein inserting theobturator assembly includes the slot having a sealing member pierceableby a distal end of a surgical instrument.
 10. A method of performing asurgical procedure comprising: providing access through a surgicalincision via a cannula assembly, the cannula assembly including a sealmember and a cannula shaft defining a slot therethrough; and insertingan obturator assembly into the cannula assembly, the obturator assemblyhaving an outer surface defining an uninterrupted channel configured toconvey insufflation fluid from a proximal-most end of the obturatorassembly to a distal-most end of the obturator assembly; supplyinginsufflation fluid into a body cavity through the uninterrupted channel;and inserting a surgical instrument through the uninterrupted channel.11. The method according to claim 10, further comprising forming a sealbetween the cannula assembly and the obturator assembly inserted throughthe cannula assembly.
 12. The method according to claim 10, furthercomprising suturing the surgical incision using a surgical instrumentinserted through the slot.
 13. The method according to claim 10, whereininserting the surgical instrument includes advancing the surgicalinstrument through the slot of the cannula shaft.
 14. The methodaccording to claim 10, wherein inserting the obturator assembly into thecannula assembly includes the uninterrupted channel configured to guidethe surgical instrument towards the slot.
 15. The method according toclaim 10, wherein inserting the obturator assembly into the cannulaassembly includes the uninterrupted channel of the obturator assemblyhaving a proximal-most end disposed adjacent an insufflation port of thecannula assembly.
 16. The method according to claim 10, whereininserting the obturator assembly into the cannula assembly includesinserting the obturator assembly through a lumen defined in the cannulaassembly, the lumen in communication with the slot.
 17. The methodaccording to claim 16, wherein inserting the obturator assembly includesthe slot having a sealing member pierceable by a distal end of asurgical instrument.